| 1 | #ifndef __LINUX_REGMAP_H |
| 2 | #define __LINUX_REGMAP_H |
| 3 | |
| 4 | /* |
| 5 | * Register map access API |
| 6 | * |
| 7 | * Copyright 2011 Wolfson Microelectronics plc |
| 8 | * |
| 9 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License version 2 as |
| 13 | * published by the Free Software Foundation. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/device.h> |
| 17 | #include <linux/list.h> |
| 18 | #include <linux/module.h> |
| 19 | |
| 20 | struct i2c_client; |
| 21 | struct spi_device; |
| 22 | |
| 23 | /* An enum of all the supported cache types */ |
| 24 | enum regcache_type { |
| 25 | REGCACHE_NONE, |
| 26 | REGCACHE_INDEXED, |
| 27 | REGCACHE_RBTREE, |
| 28 | REGCACHE_LZO |
| 29 | }; |
| 30 | |
| 31 | /** |
| 32 | * Default value for a register. We use an array of structs rather |
| 33 | * than a simple array as many modern devices have very sparse |
| 34 | * register maps. |
| 35 | * |
| 36 | * @reg: Register address. |
| 37 | * @def: Register default value. |
| 38 | */ |
| 39 | struct reg_default { |
| 40 | unsigned int reg; |
| 41 | unsigned int def; |
| 42 | }; |
| 43 | |
| 44 | /** |
| 45 | * Configuration for the register map of a device. |
| 46 | * |
| 47 | * @reg_bits: Number of bits in a register address, mandatory. |
| 48 | * @val_bits: Number of bits in a register value, mandatory. |
| 49 | * |
| 50 | * @writeable_reg: Optional callback returning true if the register |
| 51 | * can be written to. |
| 52 | * @readable_reg: Optional callback returning true if the register |
| 53 | * can be read from. |
| 54 | * @volatile_reg: Optional callback returning true if the register |
| 55 | * value can't be cached. |
| 56 | * @precious_reg: Optional callback returning true if the rgister |
| 57 | * should not be read outside of a call from the driver |
| 58 | * (eg, a clear on read interrupt status register). |
| 59 | * |
| 60 | * @max_register: Optional, specifies the maximum valid register index. |
| 61 | * @reg_defaults: Power on reset values for registers (for use with |
| 62 | * register cache support). |
| 63 | * @num_reg_defaults: Number of elements in reg_defaults. |
| 64 | * |
| 65 | * @read_flag_mask: Mask to be set in the top byte of the register when doing |
| 66 | * a read. |
| 67 | * @write_flag_mask: Mask to be set in the top byte of the register when doing |
| 68 | * a write. If both read_flag_mask and write_flag_mask are |
| 69 | * empty the regmap_bus default masks are used. |
| 70 | * |
| 71 | * @cache_type: The actual cache type. |
| 72 | * @reg_defaults_raw: Power on reset values for registers (for use with |
| 73 | * register cache support). |
| 74 | * @num_reg_defaults_raw: Number of elements in reg_defaults_raw. |
| 75 | */ |
| 76 | struct regmap_config { |
| 77 | int reg_bits; |
| 78 | int val_bits; |
| 79 | |
| 80 | bool (*writeable_reg)(struct device *dev, unsigned int reg); |
| 81 | bool (*readable_reg)(struct device *dev, unsigned int reg); |
| 82 | bool (*volatile_reg)(struct device *dev, unsigned int reg); |
| 83 | bool (*precious_reg)(struct device *dev, unsigned int reg); |
| 84 | |
| 85 | unsigned int max_register; |
| 86 | struct reg_default *reg_defaults; |
| 87 | unsigned int num_reg_defaults; |
| 88 | enum regcache_type cache_type; |
| 89 | const void *reg_defaults_raw; |
| 90 | unsigned int num_reg_defaults_raw; |
| 91 | |
| 92 | u8 read_flag_mask; |
| 93 | u8 write_flag_mask; |
| 94 | }; |
| 95 | |
| 96 | typedef int (*regmap_hw_write)(struct device *dev, const void *data, |
| 97 | size_t count); |
| 98 | typedef int (*regmap_hw_gather_write)(struct device *dev, |
| 99 | const void *reg, size_t reg_len, |
| 100 | const void *val, size_t val_len); |
| 101 | typedef int (*regmap_hw_read)(struct device *dev, |
| 102 | const void *reg_buf, size_t reg_size, |
| 103 | void *val_buf, size_t val_size); |
| 104 | |
| 105 | /** |
| 106 | * Description of a hardware bus for the register map infrastructure. |
| 107 | * |
| 108 | * @write: Write operation. |
| 109 | * @gather_write: Write operation with split register/value, return -ENOTSUPP |
| 110 | * if not implemented on a given device. |
| 111 | * @read: Read operation. Data is returned in the buffer used to transmit |
| 112 | * data. |
| 113 | * @read_flag_mask: Mask to be set in the top byte of the register when doing |
| 114 | * a read. |
| 115 | */ |
| 116 | struct regmap_bus { |
| 117 | regmap_hw_write write; |
| 118 | regmap_hw_gather_write gather_write; |
| 119 | regmap_hw_read read; |
| 120 | u8 read_flag_mask; |
| 121 | }; |
| 122 | |
| 123 | struct regmap *regmap_init(struct device *dev, |
| 124 | const struct regmap_bus *bus, |
| 125 | const struct regmap_config *config); |
| 126 | struct regmap *regmap_init_i2c(struct i2c_client *i2c, |
| 127 | const struct regmap_config *config); |
| 128 | struct regmap *regmap_init_spi(struct spi_device *dev, |
| 129 | const struct regmap_config *config); |
| 130 | |
| 131 | void regmap_exit(struct regmap *map); |
| 132 | int regmap_write(struct regmap *map, unsigned int reg, unsigned int val); |
| 133 | int regmap_raw_write(struct regmap *map, unsigned int reg, |
| 134 | const void *val, size_t val_len); |
| 135 | int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val); |
| 136 | int regmap_raw_read(struct regmap *map, unsigned int reg, |
| 137 | void *val, size_t val_len); |
| 138 | int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val, |
| 139 | size_t val_count); |
| 140 | int regmap_update_bits(struct regmap *map, unsigned int reg, |
| 141 | unsigned int mask, unsigned int val); |
| 142 | |
| 143 | int regcache_sync(struct regmap *map); |
| 144 | void regcache_cache_only(struct regmap *map, bool enable); |
| 145 | void regcache_cache_bypass(struct regmap *map, bool enable); |
| 146 | |
| 147 | #endif |